This volume deals exclusively with the phylum Cnidaria, the group of animals that, among others, contains corals, anemones and jellyfishes. All three classes in the phylum - the Hydrozoa, Scyphozoa, and Anthozoa - are discussed in details. Chapters on evolution and reproduction biology of the cnidarians are also included. Several scientists, all experts in their individual fields, have contributed to this volume. With their help and that of scientific and popular literature, we have tried to make the content as up to date as possible. You will therefore find, not only an extensive list of references, but also a wealth of information never before grouped together in a popular book dealing with the cnidarians. The text is focused, both on the biology of the group, as well as on how to keep cnidarians successfully in aquaria. The book also contains more than 960 high-quality photographs showing different groups of animals in their natural habitat and illustrating details of their biology, as well as their growth and survival in "The Modern Coral Reef Aquarium".